GNU bug report logs - #28589
27.0.50; Emacs screen often becomes blank

Previous Next

To add a comment to this bug, you must first unarchive it, by sending
a message to control AT debbugs.gnu.org, with unarchive 28589 in the body.
You can then email your comments to 28589 AT debbugs.gnu.org in the normal way.

Toggle the display of automated, internal messages from the tracker.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Katsumi Yamaoka <yamaoka <at> jpl.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50; Emacs screen often becomes blank
Date: Mon, 25 Sep 2017 10:01:30 +0900

Hi,

Emacs screen often becomes blank or blinks.  This didn't happen
the last weekend, doesn't happen sometimes but often happens.
Changing the window configuration --- scrolling a window, showing
a message of two or more lines in the echo area, etc. --- seems
to cause it.  More funny thing is, when two Emacsen are running,
the one of which the frame is not selected becomes blank.
Typing any key in the selected blank frame will help, as if
(sit-for ∞) is running.

Thanks.

In GNU Emacs 27.0.50 (build 1, i686-pc-cygwin, GTK+ Version 3.18.9)
 of 2017-09-25 built on localhost
Windowing system distributor 'The Cygwin/X Project', version 11.0.11900000

Message #8 received at 28589 <at> debbugs.gnu.org (full text, mbox):

From: Katsumi Yamaoka <yamaoka <at> jpl.org>
To: 28589 <at> debbugs.gnu.org
Subject: Re: bug#28589: 27.0.50; Emacs screen often becomes blank
Date: Tue, 26 Sep 2017 13:43:15 +0900

On Mon, 25 Sep 2017 10:01:30 +0900, Katsumi Yamaoka wrote:
> Emacs screen often becomes blank or blinks.  This didn't happen
> the last weekend, doesn't happen sometimes but often happens.
> Changing the window configuration --- scrolling a window, showing
> a message of two or more lines in the echo area, etc. --- seems
> to cause it.  More funny thing is, when two Emacsen are running,
> the one of which the frame is not selected becomes blank.
> Typing any key in the selected blank frame will help, as if
> (sit-for ∞) is running.

Reverting the change c0af83b[1] solves this problem.

[1]
Don't attempt to disable double buffering in newer GTK+ versions
<http://lists.gnu.org/archive/html/emacs-diffs/2017-09/msg00293.html>

> Thanks.

In GNU Emacs 27.0.50 (build 4, i686-pc-cygwin, GTK+ Version 3.18.9)
 of 2017-09-26 built on localhost
Windowing system distributor 'The Cygwin/X Project', version 11.0.11900000

Message #13 received at 28589-done <at> debbugs.gnu.org (full text, mbox):

From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: Katsumi Yamaoka <yamaoka <at> jpl.org>, 28589-done <at> debbugs.gnu.org
Subject: Re: bug#28589: 27.0.50; Emacs screen often becomes blank
Date: Tue, 26 Sep 2017 18:31:37 +0000

[Message part 1 (text/plain, inline)]

Katsumi Yamaoka <yamaoka <at> jpl.org> schrieb am Di., 26. Sep. 2017 um
06:44 Uhr:

> On Mon, 25 Sep 2017 10:01:30 +0900, Katsumi Yamaoka wrote:
> > Emacs screen often becomes blank or blinks.  This didn't happen
> > the last weekend, doesn't happen sometimes but often happens.
> > Changing the window configuration --- scrolling a window, showing
> > a message of two or more lines in the echo area, etc. --- seems
> > to cause it.  More funny thing is, when two Emacsen are running,
> > the one of which the frame is not selected becomes blank.
> > Typing any key in the selected blank frame will help, as if
> > (sit-for ∞) is running.
>
> Reverting the change c0af83b[1] solves this problem.
>
> [1]
> Don't attempt to disable double buffering in newer GTK+ versions
> <http://lists.gnu.org/archive/html/emacs-diffs/2017-09/msg00293.html>
>
>
Sigh, I had almost expected this would happen. Reverted with 2fa19cc551.
But now we have another time bomb in the codebase:
the gtk_widget_set_double_buffered function is deprecated and will probably
be removed sometime. This makes the migration to a pure GTK+ build even
more pressing.

[Message part 2 (text/html, inline)]

Message #16 received at 28589 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: 28589 <at> debbugs.gnu.org, p.stephani2 <at> gmail.com, yamaoka <at> jpl.org
Subject: Re: bug#28589: 27.0.50; Emacs screen often becomes blank
Date: Wed, 27 Sep 2017 10:13:39 +0200

> Sigh, I had almost expected this would happen. Reverted with 2fa19cc551.
> But now we have another time bomb in the codebase:
> the gtk_widget_set_double_buffered function is deprecated and will probably
> be removed sometime. This makes the migration to a pure GTK+ build even
> more pressing.

Looks like the decisive blow, indeed.  Admittedly, inhibiting double
buffering was a gross hack too.  But I doubt Jan had any alternative
solutions at hand when he coded that.

Do I understand correctly that the entire effect of setting double
buffering off is encapsuled in the case where a GDK_EXPOSE event is
handled?

martin

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.